I've been looking for this anime forever. I think it's japanese. Most likely late 70s or early 80s. It's kind of a variation on the giant robot type of shows. In this case the mecanical part is like a suit and the protagonist has a power to grow inside it, so the robot ends uop being like a suit of sorts. I remeber the hear had a helmet that looked like an american football helmet. The plot as I remember was unusually good but it might be a wrong recolection. Please help!!!

YES!!!!!!
Thank you very much Straydog. Many people say the same in the forum but you can't imagine how long I'll been looking for it. This is definetely a show I loved. The robot is the exact one I remembered. The only difference but it must be a trick of my memorie is that I have a memory of the boy0s body actually getting bigger inside the robot, but that be an embellishment of my shilhood mind.
THANKS!!!!!!!!!!!!!!!!!!!!!!!!